Right now the default test data for bot_update doesn't transform
revisions specifying refs for the revision except for refs starting with
refs/ on the first solution. This means that the output will just have
the ref name as the revision value, which isn't compatible with code
that requires an actual revision value.

Bug: 1047893
Change-Id: I016ad5e8db5a293dd5e6dacb5b8beba51e000949
Recipe-Nontrivial-Roll: build
Recipe-Nontrivial-Roll: infra
Recipe-Nontrivial-Roll: build_limited_scripts_slave
Recipe-Nontrivial-Roll: chrome_release
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2325761
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>